Opposing Mechanisms Drive Richness Patterns of Core and Transient Bird Species
Opposing Mechanisms Drive Richness Patterns of Core and Transient Bird Species
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DOI：
10.1086/669903
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发表时间：
2013-04-01
影响因子：
2.9
通讯作者：
White, Ethan P.
中科院分区：
文献类型：
--
作者：
Coyle, Jessica R.;Hurlbert, Allen H.;White, Ethan P.
生物多样性研究通常假设所有物种都是相同的。然而，群落中的一些物种在研究区域中维持着可生存的种群，而另一些物种只是偶尔作为短暂个体出现。在这里，我们表明北美鸟类群落可以可靠地分为核心物种组和短暂物种组，并且每个组的丰富度是由不同的过程驱动的。核心物种的丰富度主要受当地环境条件的影响，而暂存物种的丰富度主要受周围景观异质性的影响。这表明，众所周知的当地环境和景观异质性对总体物种丰富度的影响是两组对核心物种和暂存物种进行不同作用的过程的结果。物种丰富度模型应侧重于解释两种不同的模式，即核心物种和短暂物种的模式，而不是整个群落的单一模式。
Studies of biodiversity typically assume that all species are equivalent. However, some species in a community maintain viable populations in the study area, while others occur only occasionally as transient individuals. Here we show that North American bird communities can reliably be divided into core and transient species groups and that the richness of each group is driven by different processes. The richness of core species is influenced primarily by local environmental conditions, while the richness of transient species is influenced primarily by the heterogeneity of the surrounding landscape. This demonstrates that the well-known effects of the local environment and landscape heterogeneity on overall species richness are the result of two sets of processes operating differentially on core and transient species. Models of species richness should focus on explaining two distinct patterns, those of core and transient species, rather than a single pattern for the community as a whole.